What are the total valence count, electronegative difference and lewis electron dot for the following: h2, , f2, cl2, br2, i2

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing